diff --git a/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/BUILD.bazel b/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/BUILD.bazel
index c52c27986..6ba6af02e 100644
--- a/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/BUILD.bazel
+++ b/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/BUILD.bazel
@@ -12,11 +12,7 @@ MIN_IOS_VERSION = "14.0"
 swift_library(
     name = "lindera_app_lib",
     srcs = glob(["**/*.swift"]),
-    data = [
-        "//mediapipe/graphs/pose_tracking:pose_tracking_gpu.binarypb",
-        "//mediapipe/modules/pose_detection:pose_detection.tflite",
-        "//mediapipe/modules/pose_landmark:pose_landmark_full.tflite",
-    ] + [
+    data =[
         "Base.lproj/LaunchScreen.storyboard",
         "Base.lproj/Main.storyboard",
     ],
diff --git a/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/Base.lproj/Main.storyboard b/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/Base.lproj/Main.storyboard
index 15dcd337e..4248c5154 100644
--- a/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/Base.lproj/Main.storyboard
+++ b/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/Base.lproj/Main.storyboard
@@ -34,6 +34,9 @@
                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                         <state key="normal" title="Button"/>
                                         <buttonConfiguration key="configuration" style="plain" title="MODEL (LITE)"/>
+                                        <connections>
+                                            <action selector="setModelComplexity" destination="BYZ-38-t0r" eventType="touchDown" id="cVM-E4-dua"/>
+                                        </connections>
                                     </button>
                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="  Copper Labs" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontForContentSizeCategory="YES" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="UGR-Ho-hUQ">
                                         <rect key="frame" x="8" y="41" width="398" height="37"/>
diff --git a/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/ViewController.swift b/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/ViewController.swift
index b654b1122..35346d71d 100644
--- a/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/ViewController.swift
+++ b/mediapipe/examples/ios/posetracking-lindera/PoseTrackingLindera/ViewController.swift
@@ -24,8 +24,60 @@ class ViewController: UIViewController {
         
     }
     
+    
     func updateModelButtonText(){
+        var text = "MODEL "
+        switch(lindera.getModelComplexity()){
+            
+        case 0:
+            text += "(LITE)"
+            break;
+        case 1:
+            text += "(FULL)"
+            break;
+        case 2:
+            text += "(HEAVY)"
+            break;
+            
+        default:
+            text += "(Unknown)"
+        }
+        chooseModelButton.setTitle(text, for: UIControl.State.normal)
+    }
+    
+    @IBAction func setModelComplexity(){
+                let alert = UIAlertController(
+                    title: nil,
+                    message: nil,
+                    preferredStyle: .actionSheet
+                )
         
+                alert.addAction(
+                    .init(title: "MODEL (LITE)", style: .default) {[weak self] _ in
+                        self?.lindera.setModelComplexityNow(complexity: 0)
+                        self?.updateModelButtonText()
+
+                    }
+                )
+        
+                alert.addAction(
+                    .init(title: "MODEL (FULL)", style: .default) { [weak self] _ in
+                        self?.lindera.setModelComplexityNow(complexity: 1)
+                        self?.updateModelButtonText()
+
+
+                    }
+                )
+                alert.addAction(
+                    .init(title: "MODEL (HEAVY)", style: .default) { [weak self] _ in
+                        self?.lindera.setModelComplexityNow(complexity: 2)
+                        self?.updateModelButtonText()
+
+
+                    }
+                )
+        
+        present(alert, animated: true)
     }
     
     @IBAction func showLandmarksButtonTouch(sender: UIButton){
@@ -33,25 +85,7 @@ class ViewController: UIViewController {
         lindera.showLandmarks(value:  !lindera.areLandmarksShown());
         updateLandmarksButtonText()
 
-//        let alert = UIAlertController(
-//            title: nil,
-//            message: nil,
-//            preferredStyle: .actionSheet
-//        )
-//
-//        alert.addAction(
-//            .init(title: "Action 1", style: .default) { _ in
-//                print("Action1")
-//            }
-//        )
-//
-//        alert.addAction(
-//            .init(title: "Action 2", style: .default) { _ in
-//                print("Action 2")
-//            }
-//        )
-//
-//        present(alert, animated: true)
+
         
 
     }
@@ -100,7 +134,7 @@ class ViewController: UIViewController {
         
         self.liveView.bringSubviewToFront(titleview)
         updateLandmarksButtonText()
-//        self.liveView.bringSubviewToFront(chooseModelButton)
+        updateModelButtonText()
 
     }
 
diff --git a/mediapipe/graphs/pose_tracking/pose_tracking_gpu.pbtxt b/mediapipe/graphs/pose_tracking/pose_tracking_gpu.pbtxt
index 9cfe3fd29..ba429e09f 100644
--- a/mediapipe/graphs/pose_tracking/pose_tracking_gpu.pbtxt
+++ b/mediapipe/graphs/pose_tracking/pose_tracking_gpu.pbtxt
@@ -44,6 +44,8 @@ node {
 node {
   calculator: "PoseLandmarkGpu"
   input_side_packet: "ENABLE_SEGMENTATION:enable_segmentation"
+  input_side_packet: "MODEL_COMPLEXITY:model_complexity"
+
   input_stream: "IMAGE:throttled_input_video"
   output_stream: "LANDMARKS:pose_landmarks"
   output_stream: "SEGMENTATION_MASK:segmentation_mask"
diff --git a/mediapipe/objc/solutions/posetracking_gpu/BUILD b/mediapipe/objc/solutions/posetracking_gpu/BUILD
index 0b519745f..d25e498d6 100644
--- a/mediapipe/objc/solutions/posetracking_gpu/BUILD
+++ b/mediapipe/objc/solutions/posetracking_gpu/BUILD
@@ -13,6 +13,12 @@ objc_library(
     copts = [
         "-Wno-shorten-64-to-32",
     ],
+    data =  [
+        "//mediapipe/graphs/pose_tracking:pose_tracking_gpu.binarypb",
+        "//mediapipe/modules/pose_detection:pose_detection.tflite",
+        "//mediapipe/modules/pose_landmark:pose_landmark_heavy.tflite",
+        "//mediapipe/modules/pose_landmark:pose_landmark_full.tflite",
+        "//mediapipe/modules/pose_landmark:pose_landmark_lite.tflite",    ] ,
     sdk_frameworks = ["Accelerate"],
     visibility = ["//visibility:public"],
     deps = [
diff --git a/mediapipe/objc/solutions/posetracking_gpu/PoseTracking.h b/mediapipe/objc/solutions/posetracking_gpu/PoseTracking.h
index fa50c96ce..a927273d8 100644
--- a/mediapipe/objc/solutions/posetracking_gpu/PoseTracking.h
+++ b/mediapipe/objc/solutions/posetracking_gpu/PoseTracking.h
@@ -47,6 +47,7 @@
 - (void) startWithCamera: (MPPCameraInputSource*) cameraSource;
 - (void)showLandmarks: (BOOL) value;
 - (BOOL) areLandmarksShown;
+- (void) stopGraph;
 @end
 
 
diff --git a/mediapipe/objc/solutions/posetracking_gpu/PoseTracking.mm b/mediapipe/objc/solutions/posetracking_gpu/PoseTracking.mm
index 39096f817..6414f22e3 100644
--- a/mediapipe/objc/solutions/posetracking_gpu/PoseTracking.mm
+++ b/mediapipe/objc/solutions/posetracking_gpu/PoseTracking.mm
@@ -2,7 +2,7 @@
 #include "mediapipe/framework/formats/landmark.pb.h"
 #import "mediapipe/objc/MPPGraph.h"
 #import "mediapipe/objc/MPPTimestampConverter.h"
-
+#include "mediapipe/framework/packet.h"
 
 static const char* kVideoQueueLabel = "com.google.mediapipe.example.videoQueue";
 static const char* kLandmarksOutputStream = "pose_landmarks";
@@ -162,6 +162,10 @@ static const char* kLandmarksOutputStream = "pose_landmarks";
         
         weakSelf.poseTrackingResultsListener(results);
     };
+    
+    
+    
+    
     self->mediapipeGraph.delegate = self->poseTrackingGraphDelegate;
     
     
@@ -184,6 +188,7 @@ static const char* kLandmarksOutputStream = "pose_landmarks";
 
 - (void)startGraph {
   // Start running self.mediapipeGraph.
+[self->mediapipeGraph setSidePacket:mediapipe::MakePacket<int>(self.poseTrackingOptions.modelComplexity) named:"model_complexity"];
   NSError* error;
   if (![self->mediapipeGraph startWithError:&error]) {
     NSLog(@"Failed to start graph: %@", error);
@@ -193,6 +198,20 @@ static const char* kLandmarksOutputStream = "pose_landmarks";
   }
 }
 
+- (void) stopGraph {
+    [self->mediapipeGraph cancel];
+    NSError* error;
+    if ([self->mediapipeGraph closeAllInputStreamsWithError: &error]){
+        if (![self->mediapipeGraph waitUntilDoneWithError:&error]){
+            NSLog(@"Failed to stop graph: %@", error);
+
+        }
+    }else {
+        NSLog(@"Failed to close input streams: %@", error);
+
+    }
+    
+}
 - (void) startWithCamera: (MPPCameraInputSource*) cameraSource {
     [cameraSource setDelegate:self queue:self.videoQueue];
 
diff --git a/mediapipe/objc/solutions/posetracking_gpu/PoseTrackingOptions.h b/mediapipe/objc/solutions/posetracking_gpu/PoseTrackingOptions.h
index 40bbff0ae..c7482dc33 100644
--- a/mediapipe/objc/solutions/posetracking_gpu/PoseTrackingOptions.h
+++ b/mediapipe/objc/solutions/posetracking_gpu/PoseTrackingOptions.h
@@ -5,12 +5,16 @@
 #ifndef MEDIAPIPE_POSETRACKINGOPTIONS_H
 #define MEDIAPIPE_POSETRACKINGOPTIONS_H
 #import <Foundation/Foundation.h>
-@interface PoseTrackingOptions: NSObject
 
+
+
+@interface PoseTrackingOptions: NSObject
+@property(nonatomic) int modelComplexity;
 @property(nonatomic) bool showLandmarks;
 //@property(nonatomic) int cameraRotation;
 
-- (instancetype) initWithShowLandmarks : (bool) showLandmarks;
+
+- (instancetype) initWithShowLandmarks : (bool) showLandmarks modelComplexity:  (int) modelComplexity;
 
 @end
 
diff --git a/mediapipe/objc/solutions/posetracking_gpu/PoseTrackingOptions.mm b/mediapipe/objc/solutions/posetracking_gpu/PoseTrackingOptions.mm
index f9c8911c3..6b52ce52b 100644
--- a/mediapipe/objc/solutions/posetracking_gpu/PoseTrackingOptions.mm
+++ b/mediapipe/objc/solutions/posetracking_gpu/PoseTrackingOptions.mm
@@ -2,9 +2,10 @@
 
 @implementation PoseTrackingOptions
 
-- (instancetype) initWithShowLandmarks : (bool) showLandmarks {
+- (instancetype) initWithShowLandmarks : (bool) showLandmarks modelComplexity:  (int) modelComplexity{
 //    self.cameraRotation = cameraRotation;
     self.showLandmarks = showLandmarks;
+    self.modelComplexity = modelComplexity;
     return self;
 }
 
diff --git a/mediapipe/swift/solutions/lindera/Lindera.swift b/mediapipe/swift/solutions/lindera/Lindera.swift
index 5719cf80e..12d961f9d 100644
--- a/mediapipe/swift/solutions/lindera/Lindera.swift
+++ b/mediapipe/swift/solutions/lindera/Lindera.swift
@@ -7,7 +7,7 @@ import UIKit
 ///  TFLite models are also loaded when you initialize this class
 public final class Lindera{
     // initalize the PoseTracking api and load models
-    let poseTracking:PoseTracking = PoseTracking(poseTrackingOptions: PoseTrackingOptions(showLandmarks: true))
+    var poseTracking:PoseTracking = PoseTracking(poseTrackingOptions: PoseTrackingOptions(showLandmarks: true,modelComplexity: 1))
     // attach Mediapipe camera helper to our class
     let cameraSource = MPPCameraInputSource()
 
@@ -26,6 +26,24 @@ public final class Lindera{
     public func areLandmarksShown() -> Bool{
         return self.poseTracking.areLandmarksShown()
     }
+    public func getModelComplexity() -> Int {
+        return Int(self.poseTracking.poseTrackingOptions.modelComplexity);
+    }
+    public func setModelComplexityNow(complexity:Int){
+        let poseTrackingOptions = poseTracking.poseTrackingOptions
+        
+        poseTrackingOptions?.modelComplexity = Int32(complexity)
+        
+        poseTracking = PoseTracking(poseTrackingOptions: poseTrackingOptions)
+        startPoseTracking()
+        startCamera()
+        
+
+
+
+    }
+    
+    
 //    public func getModelComplexity() -> Int{
 //        return self.poseTracking
 //    }
@@ -35,12 +53,20 @@ public final class Lindera{
         // this will be the main camera view
         let liveView = UIView()
         
-        // set camera preferences
+        startPoseTracking()
+        
+
+
+        return liveView
+        
+    }()
+    private func  startPoseTracking(){
+            // set camera preferences
         self.cameraSource.sessionPreset = AVCaptureSession.Preset.high.rawValue
         self.cameraSource.cameraPosition = AVCaptureDevice.Position.front
         self.cameraSource.orientation = AVCaptureVideoOrientation.portrait
         if (self.cameraSource.orientation == AVCaptureVideoOrientation.portrait){
-            self.cameraSource.videoMirrored = true
+        self.cameraSource.videoMirrored = true
         }
         // call LinderaDelegate on pose tracking results
         self.poseTracking.poseTrackingResultsListener = {[weak self] results in
@@ -53,16 +79,11 @@ public final class Lindera{
         self.poseTracking.startGraph()
         // attach camera's output with poseTracking object and its videoQueue
         self.cameraSource.setDelegate(self.poseTracking, queue: self.poseTracking.videoQueue)
-
-        return liveView
-        
-    }()
-    
+    }
     public required init(){}
     
     
     public func startCamera(_ completion: ((Result<Void, Error>) -> Void)? = nil) {
-        if (!self.cameraSource.isRunning){
         // set our rendering layer frame according to cameraView boundry
         self.poseTracking.renderer.layer.frame = cameraView.layer.bounds
         // attach render CALayer on cameraView to render output to
@@ -84,7 +105,6 @@ public final class Lindera{
                 }
         })
             
-        }
         
         
         
@@ -98,6 +118,7 @@ public final class Lindera{
             
         }
     }
+    
     /// switches camera from front to back and vice versa
     func switchCamera(_ completion: ((Result<Void, Error>) -> Void)? = nil) {
         self.poseTracking.videoQueue.async { [weak self] in